Plan 9 - man page for reboot (plan9 section 3)
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reboot - reboot CPU after loss of file server connection
write(cfd, "push reboot", 11);
fd = open("#^/deltat", OWRITE);
fprint(fd, "%d", delaytime);
This is a combined device and stream module (see stream(3)). The bootstrap program
boot(8) pushes the module onto the file server connection of a CPU server. The system
will then reboot automatically if the connection hangs up. The reboot may be postponed by
delaytime milliseconds by writing the decimal value of delaytime to Conventionally, this
is done by /rc/bin/cpurc (see cpurc(8)). This mechanism may be used to cause the machines
at a particular site to come up in a fixed order, such as after a power failure.
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